Workshop on Quantum Measurements and Operations for Criptography and Information Processing
Quantum Measurements and Operations for Criptography and Information Processing
Quantum TLSs and Kondo like traps as possible sources of decoherence in superconducting qubits
aula 326 - Martedì 24 maggio, ore 14.00>VITAE:
Lara Faoro, studied at Trieste University and obtained his Ph.D at the
Polytechnic of Turin in 2001. Currently she is working as postdoctoral
associate at Rutgers and Princeton University.
Her main interests are related to the implementation of quantum information
with mesoscopic devices.
Decoherence severely limits the performance of superconducting
circuits based on Josephson junctions. Experiments performed on SET and
superconducting qubits provide a wealth of information on the characteristics
of the charge noise power spectrum both at high and low frequencies.
Prompted by the experimental results, we consider a model of dephasing
due to the environment of weakly interacting quantum TLSs; we show that
such environment might provide a significant source of dephasing but the
detailed characteristics of the noise power spectrum are in a qualitative
and quantitative disagreement with the data. We propose a novel microscopic
mechanism of decoherence based on Kondo like traps and argue that within
this model we can explain most features observed in the experiments.
